Computer Graphics Metafile (CGM) is an ISO standard, defined by ISO/IEC
8632:1999, for the interchange of 2D vector and mixed vector/raster graphics.
WebCGM is a profile of CGM, which adds Web linking and is optimized for Web
applications in technical illustration, electronic documentation, geophysical
data visualization, and similar fields. First published (1.0) in 1999, WebCGM
unifies potentially diverse approaches to CGM utilization in Web document
applications. It therefore represents a significant interoperability agreement
amongst major users and implementers of the ISO CGM standard.

The design criteria for WebCGM aim to balance graphical expressive power on
the one hand, versus simplicity and implementability on the other. A small but
powerful set of standardized metadata elements supports the functionalities of
hyperlinking and document navigation, picture structuring and layering, and
enabling search and query of WebCGM picture content.

The present version, WebCGM 2.1, refines and completes the features of the
major WebCGM 2.0 release. WebCGM 2.0 added a DOM (API) specification for
programmatic access to WebCGM objects, a specification of an XML Companion File
(XCF) architecture, and extended the graphical and intelligent content of
WebCGM 1.0.

This section describes the status of this document at the time of its
publication. Other documents may supersede this document. A list of current W3C
publications and the latest revision of this technical report can be found in
the W3C technical reports index at
http://www.w3.org/TR/.

W3C Advisory Committee Representatives are invited to submit their formal
review per the instructions in the Call for Review (see Advisory Committee
questionnaires). The review period ends on 11 February 2010. (Please
note that an incorrect review end date of 31 January was corrected in place on
20 January.). Members of the public are also invited to send comments on
this Proposed Recommendation to the public email list public-webcgm@w3.org
(public
archive). Use the prefix '[WebCGM 2.1 PR comment]' in the subject line of
your email.

This document is based upon the WebCGM 2.1 Candidate
Recommendation of 15 September 2009. Feedback received during that review
resulted in clarifications and minor changes, but no major changes. The WebCGM
Working Group believes that this specification addresses all Candidate
Recommendation issues. The list of changes made since the Candidate
Recommendation is available in Appendix
D1.

The following features as "at risk" mentioned in the WebCGM 2.1 Candidate
Recommendation version for which there were not at least two
implementations at the end of the Candidate Recommendation period were removed
from this specification:

XCF access to the new 2.1 geometric transform functionality

ACI access to Line Type Continuation

ACI access to Edge Type Continuation

ACI access to Hatch Style Definition

Apart from the above 4 features as "at risk" removed from this
specification, each test in the WebCGM 2.1 Test Suite has at least two passing
implementations developed independently.

Publication as a Proposed Recommendation does not imply endorsement by the
W3C Membership. This is a draft document and may be updated, replaced or
obsoleted by other documents at any time. It is inappropriate to cite this
document as other than work in progress.

WebCGM 2.1 is related to the previous W3C work on WebCGM 1.0 and 2.0. WebCGM 2.0 was
simultaneously published by W3C as a Recommendation and by OASIS as an OASIS
Standard. The two versions are identical in technical content, differing only
in the formatting and presentation conventions of the two organizations. It is
agreed that WebCGM 2.1 will be progressed by the same collaborative process and
will result in technically a identical Recommendation and OASIS Standard.

Publication as a Proposed Recommendation does not imply endorsement by the
W3C Membership. This is a draft document and may be updated, replaced or
obsoleted by other documents at any time. It is inappropriate to cite this
document as other than work in progress.